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Two persons P and Q crosses the river st...

Two persons `P` and `Q` crosses the river starting the point `A` on one side to exactly opposite point `B` on the other bank of the river. The person `P` crosses the river in the shortest path. The person `Q` crosses the river in shortest time and walks back to point `B`.Velocity of river is `3 kmph` and speed of each person is `5kmph` w.r.t river. If the two persons reach the point `B` in the same time, then the speed of walk of `Q` is .

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Two persons P and Q crosses the river starting from point A on one side to exactly opposite point B on the other bank of the river. The person P crosses the river in the shortest path. The person Q crosses the river in shortest time and walks back to point B. Velocity of river is 3 kmph and speed of each boat is 5 kmph w.r.t river. If the two persons reach the point B in the same time, then the speed of walk of Q is

Two persons P and Q crosses the river starting from point A on one side to exactly opposite point B on the other bank of the river. The person P crosses the river in the shortest path. The person Q crosses the river in shortest time and walks back to point B. Velocity of river is 3 kmph and speed of each boat is 5 kmph w.r.t river. If the two persons reach the point B in the same time, then the speed of walk of Q is

(A): A man is on the northern bank of a river. To cross the river in a shortest time he should swim due south. (R) : Man should move opposite to the river flow to cross in shortest time.

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